Performance of phosphate solubilizing bacteria for improving growth and yield of rice (Oryza Sativa L.) in the presence of phosphorus fertilizer

ABSTRACT: Environmental inappropriate effects caused by consumption of chemical fertilizers increased the importance of biofertilizer. The beneficial effects of phosphate solubilizing bacteria (PSB) on crop productivity have been widely described, but the use of PSB as biofertilizer is scarcely documented in rice plant. The effects of PSB on growth yield and yield components of rice (Oryza Sativa L.) and determination the best methods for application were studied in a field experiment at rice research institute of Iran - Rasht. A factorial experiment was arranged in randomized complete block design with three replication and six treatments. Treatments included (control) (T0) , the use of PCF with recommendation amount based on soil test (T1) , socked of transplant roots with PSB before planting in the main field with 50% of the recommended amount of PCF (T2) , socked of transplant roots with PSB before planting in the main field and put the PSB in the input irrigation water to plots one month after transfer of transplanting to the main field with 50% of the recommended amount of PCF (T3) , putting PSB in the input irrigation water to plots one month after the transfer of transplanting to the main field with 50% of the recommended amount of PCF (T4) , putting PSB in the input irrigation water to plots one and two month after transfer of transplanting to the main field with 50% of the recommended amount of PCF (T5). Results indicated that PSB and PCF had a significant influence on grain yield, biological yield and grain phosphorus uptake while these treatments on the straw phosphorus uptake and plant heights were not affected. Study of comparison means showed that use of biofertilizer in different ways increased 1 to 11 percents in grain yield and 6 to 8 percents in grain phosphorus uptake than control. So results suggest that consumption of biofertilizer were able to stimulate growth and increased grain yield and it will be decreased in presence of phosphate solubilizing bacteria.